Phylum Echinodermata Class Holothuroidea Number of families 25
Worm-like echinoderms with a mouth surrounded by feeding tentacles and often a reduced skeleton of microscopic ossicles
Photo: A sea cucumber (Bohadschia argus) expelling cuverian tubules for defense. (Photo by © A. Flowers & L. Newman/Photo Researchers, Inc. Reproduced by permission.)
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